A.与kπ+(k∈Z)

B.kπ±与(k∈Z)

C.(2k+1)π与(4k±1)π(k∈Z)

D.kπ+与2kπ±(k∈Z)

(1)化简f(α);

(2)若α是第三象限的角，且cos(α-)=,求f(α)的值;

(3)若α=-1 860°,求f(α)的值.

①sin(A+B)+sinC;②cos(A+B)+cosC;③sin(2A+2B)+sin2C;④cos(2A+2B)+cos2C.其中为常数的是（    ）

A.①②          B.②③            C.③④             D.①④

A.           B.              C.           D.

A.cos(4π-α)                         B.sin(-α-2π)

C.sin(3π+α)                         D.-cos(α-6π)

A.cos(kπ+)                       B.cos(kπ-)

C.sin(-)                      D.cos(2kπ+)

A.                       B.

C.                       D.